ogar: retire the codebook COUNT_FUSE for plug-and-play activation - #954
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Operator direction: migrate the compile-time fuse to the ogar-vocab +
hotplug.rs pattern — "akin to USB plug and play".
A hand-maintained mirror plus a global equality assert is the OPPOSITE of
plug-and-play: a device that works only if you also patch the host's driver
table by hand, in another repo, in another PR. The assert can only ever DETECT
the omission, never prevent or resolve it — and it detected it in the wrong
place. This crate is workspace-excluded, so the fuse did not gate the
PRODUCER's CI; it gated every AR-aware CONSUMER's build. A producer-side
bookkeeping lapse became a downstream outage.
Measured, today: `osm_street_node` (0x0F0B) was minted in OGAR while its mirror
row sat in a separate unopened PR. The fuse panicked at const-eval (E0080) and
killed a production deploy AT COMPILE — for a concept that deploy never used.
The deploy then reproduced the failure after the mirror landed, because Docker
had cached the pre-fix clone.
The inversion: the DEVICE announces, the HOST enumerates and binds. A consumer
declares one HotPlug naming the classids it actually plugs; OgarAuthority
resolves exactly those and returns a NAMED ActivationDrift for the ids that
consumer USES. A concept nobody plugs cannot break anyone's build, so minting
one is a single PR again.
DELETING THE FUSE LOSES NO DETECTION, and that is checkable rather than
asserted:
- `assert_codebook_parity` already checks the FULL bijection — forward, reverse
and domain agreement — which strictly CONTAINS the length equality the fuse
performed. The fuse detected a subset of what the test detects.
- The fuse's one unique property was firing during `cargo build`. That is
precisely the harmful part, per above.
Verified by reproducing the incident's exact shape: with the `osm_street_node`
row removed from the mirror (mirror one SHORTER than OGAR — the state that
produced E0080),
cargo build -> SUCCEEDS ("Finished `dev` profile")
parity test -> FAILS ("OGAR has osm_street_node=0x0f0b but contract
mirror is missing/wrong")
Detection preserved, blast radius removed. Mirror restored, 63/63 green.
New test `an_unknown_classid_drifts_at_the_plug_not_at_the_build` pins both
halves: a plugged-but-unminted id drifts BY NAME, and a real minted concept the
consumer does not plug is INERT — activation resolves exactly the plugged ids,
never the whole table. That second assertion is the one the fuse could never
have satisfied.
Follow-on (NOT here): the mirror itself remains hand-maintained. Prefer
resolving through OgarAuthority over reading it; the mirror is the BBB-safe
fallback for consumers that cannot depend on OGAR at all.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMeiLmtDKhomJNSo2ecbJw
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📝 WalkthroughWalkthroughOGAR removes the compile-time ChangesOGAR runtime validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The PR removes the compile-time codebook fuse in favor of plug-specific activation, reducing unrelated consumer build failures. It is mergeable with owner follow-up on two minor test issues: pinning the minted regression fixture and restricting the test module to test builds; these leave bounded regression and build-surface risk but no demonstrated production failure. Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
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| let bogus = HotPlug { | ||
| consumer: "tesseract-ogar", | ||
| classids: &[0xDEAD], | ||
| covered: &[], |
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This uses an ID that is absent from OGAR itself, so it only verifies the existing resolve_hotplug unknown-ID path. In the regression this change is meant to address, the ID is present in ogar_vocab but absent from the contract mirror; because OgarAuthority::activate consults only ogar_vocab, hot-plugging such an ID succeeds while mirror-based consumers still return None. Consequently the new test does not establish the claimed per-plug detection for the exact add/remove drift whose compile-time check is being deleted.
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Correct, and this was the most valuable finding on the PR — thank you. Fixed in 1a2aeca7.
You identified precisely where the migration was incomplete rather than wrong. OgarAuthority::activate consults only ogar_vocab, so a concept present in OGAR but missing from the wire mirror activated green, while mirror-reading consumers resolved None. My test used 0xDEAD — absent from OGAR itself — so it exercised the pre-existing unknown-id path and established nothing about the drift class whose compile-time check I was deleting.
The PR's safety argument still held (the parity test catches mirror drift, and I'd verified that by reproducing the incident shape). But detection had been relocated onto a test in a workspace-excluded crate instead of becoming per-plug, which is exactly the property the migration was supposed to deliver.
What landed
The authority now cross-checks the mirror for the plugged concepts only. That is the right home: a consumer holding OGAR can see both sides, and a mirror-only consumer cannot call activate at all.
- New
ActivationDrift::MirrorDrift { concept, authority_id, mirror_id }. No exhaustive match on this enum exists outside the contract (checked), so the variant is additive. mirror_disagreement(concepts, lookup)takes the lookup as a parameter;verify_against_mirrorbinds the real mirror. The split is deliberate — with the real mirror there is by construction no disagreeing concept, so a test using it could only assert the happy path and would still pass with the checker deleted.
Verified by reproducing exactly the case you described
Removed a plugged concept (textline, 0x0805) from the mirror:
before -> activation green (the gap you named)
after -> MirrorDrift { concept: "textline",
authority_id: 2053, mirror_id: None }
The new contract test also covers the case a length-equality fuse could never have caught at all: a concept present at the wrong id, where the counts still match. Plus the silence case, so the checker can't "pass" by objecting to everything.
63/63 + contract hotplug tests green, clippy clean.
Generated by Claude Code
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Inline comments:
In `@crates/lance-graph-ogar/src/lib.rs`:
- Around line 400-416: Update the OGAR activation test around HotPlug and
activate to assert that the canonical osm_street_node concept exists with its
expected ID before activation, then remove the redundant final absence
assertion; retain the existing exact one-item concepts assertion.
- Around line 371-383: The hotplug_bridge_tests module is currently compiled
outside test builds; add #[cfg(test)] directly before the hotplug_bridge_tests
module so its unit tests and contents are compiled only during testing.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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crates/lance-graph-ogar/src/lib.rs
Codex was right, and the finding was sharp: `OgarAuthority::activate` consults
only `ogar_vocab`, so it could NOT see the drift class the deleted COUNT_FUSE
guarded — an id present in OGAR but absent (or at a different id) in the
contract's wire mirror. Such a plug activated GREEN while mirror-reading
consumers resolved `None`. The previous test used 0xDEAD, an id absent from
OGAR itself, so it only exercised the pre-existing unknown-id path and did not
establish the per-plug detection the PR claimed.
The migration was therefore incomplete rather than wrong: the safety argument
held (the parity TEST catches mirror drift, proven by reproducing the incident
shape) but detection had been dropped onto a test in a workspace-EXCLUDED
crate instead of becoming per-plug.
Closed by making the authority cross-check the mirror for the PLUGGED concepts
only. The authority is the only place both sides are in scope — a consumer
holding OGAR can see the mirror, and a mirror-only consumer cannot call
`activate` at all.
- New `ActivationDrift::MirrorDrift { concept, authority_id, mirror_id }` —
no exhaustive match on this enum exists outside the contract (checked), so
the variant is additive.
- `mirror_disagreement(concepts, lookup)` takes the lookup as a parameter, and
`verify_against_mirror` binds the real mirror. The split is deliberate: with
the real mirror there is BY CONSTRUCTION no disagreeing concept, so a test
using it could only assert the happy path and would still pass with the
checker deleted.
Verified end-to-end by removing a PLUGGED concept (`textline`, 0x0805) from
the mirror:
before -> activation green (the gap codex named)
after -> MirrorDrift { concept: "textline", authority_id: 2053,
mirror_id: None }
The new contract test covers three cases, including the one a length-equality
fuse could never have caught: a concept present at the WRONG id, where the
counts still match. Plus the silence case, so the checker cannot "pass" by
objecting to everything.
Also from CodeRabbit on the same PR:
- PIN the regression fixture: assert `osm_street_node` is still minted at
0x0F0B before relying on it, so the test cannot silently stop covering the
regression it is named for if the concept is removed or renamed.
- DROP the trailing "osm_street_node is absent" assertion — implied by the
exact-equality assertion above it, i.e. the vacuous shape this workspace's
own falsifiability rule rejects.
REJECTED, with evidence: CodeRabbit's "gate hotplug_bridge_tests with
#[cfg(test)]". It is already gated — `#[cfg(test)]` sits at lib.rs:331,
directly above `mod hotplug_bridge_tests` at :332. The finding anchored to
line 383, inside the module body.
63/63 + contract hotplug tests green; clippy clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMeiLmtDKhomJNSo2ecbJw
Operator direction: migrate the compile-time fuse to the
ogar-vocab+hotplug.rspattern — "akin to USB plug and play". Follow-up to #953, which was the hotfix; this removes the failure class.Why the fuse was the wrong shape
A hand-maintained mirror plus a global equality assert is the opposite of plug-and-play: a device that works only if you also patch the host's driver table by hand, in another repo, in another PR. The assert can only ever detect the omission — never prevent or resolve it.
And it detected it in the wrong place.
lance-graph-ogaris workspace-excluded, so the fuse did not gate the producer's CI; it gated every AR-aware consumer's build. A producer-side bookkeeping lapse became a downstream outage.What it cost, measured today
osm_street_node(0x0F0B) was minted in OGAR (#268) while its mirror row sat in a separate, unopened PR. The fuse panicked at const-eval:and killed a production deploy at compile — for a concept that deploy never used. The redeploy then reproduced it, because Docker had cached the pre-fix clone (q2 #130).
The inversion
The device announces; the host enumerates and binds. A consumer declares one
HotPlugnaming the classids it actually plugs, andOgarAuthorityresolves exactly those, returning a namedActivationDriftfor the ids that consumer uses. A concept nobody plugs cannot break anyone's build — so minting one is a single PR again.The socket (
lance_graph_contract::hotplug) and the authority (OgarAuthority→resolve_hotplug) already existed. This PR removes what they made redundant.Deleting the fuse loses no detection — and that is checked, not asserted
assert_codebook_parityalready checks the full bijection — forward, reverse, and domain agreement — which strictly contains the length equality the fuse performed. The fuse detected a subset of what the test detects.cargo build. Per above, that is precisely the harmful part.Verified by reproducing the incident's exact shape. With the
osm_street_noderow removed from the mirror — mirror one shorter than OGAR, the state that producedE0080:cargo buildE0080, build deaddevprofileOGAR has osm_street_node=0x0f0b but contract mirror is missing/wrongDetection preserved, blast radius removed. Mirror restored, 63/63 green.
New test
an_unknown_classid_drifts_at_the_plug_not_at_the_buildpins both halves:UnknownClassid(0xDEAD));That second assertion is the one the fuse could never have satisfied, and it is the property that would have prevented today's outage.
Not in this PR
The mirror itself remains hand-maintained. The doctrine added to the module docs is: prefer resolving through
OgarAuthorityover reading the mirror — the mirror is the BBB-safe fallback for consumers that cannot depend on OGAR at all, and a stale mirror is now a test failure here rather than a silent mis-resolution there.Removing the mirror entirely would require the contract to depend on
ogar-vocab, which its own docs forbid (zero-dep; a path dep breaks every CI cargo invocation at workspace-load time). That is a larger design question, deliberately left open.Generated by Claude Code
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